--- a/toolkit/mozapps/extensions/test/xpcshell/xpcshell-shared.ini
+++ b/toolkit/mozapps/extensions/test/xpcshell/xpcshell-shared.ini
@@ -257,17 +257,17 @@ skip-if = os == "android"
 # Bug 676992: test consistently fails on Android
 fail-if = os == "android"
 tags = blocklist
 [test_pref_properties.js]
 [test_registry.js]
 [test_safemode.js]
 [test_signed_updatepref.js]
 run-if = addon_signing
-skip-if = require_signing
+skip-if = require_signing || !allow_legacy_extensions
 [test_signed_verify.js]
 run-if = addon_signing
 [test_signed_inject.js]
 run-if = addon_signing
 # Bug 1394122
 skip-if = true
 [test_signed_install.js]
 run-if = addon_signing